TABLE 4.

The net reclassification improvement (NRI) amongst 200 patients

	Clinician's estimates of the probability of pneumonia after LDCT			Net reclassification
	Excluded/ low	Intermediate/ high/certain	Total
Patients with pneumonia according to the adjudication committee (n=143)
Clinician's estimates of the probability of pneumonia before LDCT				Net reclassification=6–18 = –12 patients (–8.4% of the 143 patients with pneumonia)
Excluded/low	2	6
Intermediate/high/certain	18	117
Total			143
Patients without pneumonia according to the adjudication committee (n=57)
Clinician's estimates of the probability of pneumonia before LDCT				Net reclassification=29–1 = +28 patients (+49.1% of the 57 patients without pneumonia)
Excluded/low	8	1
Intermediate/high/certain	29	19
Total			57
Total patients			200	Absolute NRI=28–12 = +16 patients (8.0% of all 200 patients)

The values in bold show patients correctly reclassified by the new model, while the values in italic show patients incorrectly reclassified by the new model. The absolute number of patients correctly reclassified is –12 patients among those with pneumonia and +28 patients among those without pneumonia. Overall, the absolute number of patients correctly reclassified is thus +16 patients, which corresponds to 8.0% of all patients in the sample. LDCT: low-dose computed tomography.